Babel-polyfill Promises and “finally” support

Question

如果我在React-Redux堆栈的项目构建中使用babel-polyfill ，如何启用finally方法支持

Answer 1

Actually, now it has a proposal , and it's recently got into Stage-3, WebKit already supports it . Spec compliant shim/polyfill libraries are already available too. We can expect an update from the Promise polyfill library maintainers also.

Answer 2

I believe, the Babel-Polyfill shim uses core-js under the hood, which does support Promise.finally: https://github.com/zloirock/core-js#commonjs

Answer 3

The ES6 standard does not support the finally phase of a promise, as TJ Crowder mentioned in the comments to your question. If you want that kind of support, you might look into promises from a library like RSVP .